Universal and deterministic manipulation of the quantum state of harmonic oscillators: a route to unitary gates for Fock State qubits

We present a simple quantum circuit that allows for the universal and deterministic manipulation of the quantum state of confined harmonic oscillators. The scheme is based on the selective interactions of the referred oscillator with an auxiliary three-level system and a classical external driving source, and enables any unitary operations on Fock states, two-by-two. One circuit is equivalent to a single qubit unitary logical gate on Fock states qubits. Sequences of similar protocols allow for complete, deterministic and state-independent manipulation of the harmonic oscillator quantum state.Comment: 4 pages, 4 figure

Simulation of the hydrogen ground state in Stochastic Electrodynamics

Stochastic electrodynamics is a classical theory which assumes that the physical vacuum consists of classical stochastic fields with average energy $\frac{1}{2}\hbar \omega$ in each mode, i.e., the zero-point Planck spectrum. While this classical theory explains many quantum phenomena related to harmonic oscillator problems, hard results on nonlinear systems are still lacking. In this work the hydrogen ground state is studied by numerically solving the Abraham -- Lorentz equation in the dipole approximation. First the stochastic Gaussian field is represented by a sum over Gaussian frequency components, next the dynamics is solved numerically using OpenCL. The approach improves on work by Cole and Zou 2003 by treating the full $3d$ problem and reaching longer simulation times. The results are compared with a conjecture for the ground state phase space density. Though short time results suggest a trend towards confirmation, in all attempted modelings the atom ionises at longer times.Comment: 20 pages, 9 figures. Published version, minor change

Coherent evolution via reservoir driven holonomy

We show that in the limit of strongly interacting environment a system initially prepared in a Decoherence Free Subspace (DFS) coherently evolves in time, adiabatically following the changes of the DFS. If the reservoir cyclicly evolves in time, the DFS states acquire an holonomy.Comment: 4 page

Estudo da FAPAR em regiões fitoecológicas brasileiras através de série temporal derivada do NDVI/AVHRR.

The objective of this work is to study the behavior of Brazilian vegetation throughout time series of Fraction of Photosynthetically Active Radiation (FAPAR) absorbed by a plant canopy derived from vegetation index of the A VHRR sensor; observing the variations of the types of vegetation, influences and relationships with the cIimate. The F AP AR dataset has spatial resolution of 0.1 °xO.1 o and temporal resolution of 10 days for the period 1982 to 1999. The data were investigated considering the seasonal and interannual variations for phytoecological regions of the country. The FAPAR results show: the largest values were observed in Evergreen Broadleaf Forests (Dense and Open) and Campinarana, the lesser amplitude of variation of FAPAR occur in Savanna and Savanna-Steppe, due to adaptation to environmental changes. Analyses of F AP AR demonstrate that ecosystems with ali strata and structured soil have higher values. Even though, the preliminary results confirm that exists evidences ofrelation between the behavior of the FAPAR and weather conditions. The ENSO events have influence on interannual variations of FAPAR, mainly in the North and Northeast. Furthermore, the discussion presents that the FAPAR has potential to be used as an indicator of the photosynthetic process and consequently in the monitoring ofprimary production

Linear entropy fails to predict entanglement behavior in low-density fermionic systems

Entanglement is considered a fundamental ingredient for quantum technologies and condensed matter systems are among the good candidates for quantum devices. For bipartite pure states the von Neumann entropy is a proper measure of entanglement, while the linear entropy, associated to the mixedness of the reduced density matrices, is a simpler quantity to be obtained and is considered to be qualitatively equivalent to the von Neumann. Here we investigate both linear and von Neumann entropies for quantifying entanglement in homogeneous, superlattice and disordered Hubbard chains. We find regimes of parameters for which the linear entropy fails in reproducing the qualitative behavior of the von Neumann entropy. This then may lead to incorrect predictions i) of maximum and minimum entanglement states and ii) of quantum phase transitions

Some new aspects of main eigenvalues of graphs

An eigenvalue of the adjacency matrix of a graph is said to be main if the all-1 vector is non-orthogonal to the associated eigenspace. This paper explores some new aspects of the study of main eigenvalues of graphs, investigating specifically cones over strongly regular graphs and graphs for which the least eigenvalue is non-main. In this case, we characterize paths and trees with diameter-3 satisfying the property. We may note that the importance of least eigenvalues of graphs for the equilibria of social and economic networks was recently uncovered in literature.publishe

Análise da interferências no NDVI do AVHRR e conjunto de dados alternativo.

Dados do A VHRR têm sido muito usados para o acompanhamento das variações sazonais e interanuais da cobertura vegetal brasileira. Estes dados apresentam ruídos resultantes de interferências do sensor e de condições atmosféricas. O presente estudo relata estas interferências, apresenta e avalia um novo conjunto de NOVI derivado daquele disponibilizado pela NASA/NOAA, o EFAI-NDVI ("European Fourier-Adjusted and Interpolated NDVY'), gerado por meio da análise do comportamento da série temporal dos dados brutos. Os resultados mostram padrões de variações e comportamentos sazonais e interanuais da vegetação para várias regiões do país. As resoluções temporal e espacial das imagens permitem mapear e acompanhar estas variações em pequena escala, indicando que os dados de refectância derivados dos satélites de órbita polar podem ser utilizados no monitoramento e gestão ambiental, mas devendo ser cuidadosamente pré-processados para reduzir interferências do sensor e da atmosfera

The Need for Knowledge Extraction: Understanding Harmful Gambling Behavior with Neural Networks

Responsible gambling is a field of study that involves supporting gamblers so as to reduce the harm that their gambling activity might cause. Recently in the literature, machine learning algorithms have been introduced as a way to predict potentially harmful gambling based on patterns of gambling behavior, such as trends in amounts wagered and the time spent gambling. In this paper, neural network models are analyzed to help predict the outcome of a partial proxy for harmful gambling behavior: when a gambler “self-excludes”, requesting a gambling operator to prevent them from accessing gambling opportunities. Drawing on survey and interview insights from industry and public officials as to the importance of interpretability, a variant of the knowledge extraction algorithm TREPAN is proposed which can produce compact, human-readable logic rules efficiently, given a neural network trained on gambling data. To the best of our knowledge, this paper reports the first industrial-strength application of knowledge extraction from neural networks, which otherwise are black-boxes unable to provide the explanatory insights which are crucially required in this area of application. We show that through knowledge extraction one can explore and validate the kinds of behavioral and demographic profiles that best predict self-exclusion, while developing a machine learning approach with greater potential for adoption by industry and treatment providers. Experimental results reported in this paper indicate that the rules extracted can achieve high fidelity to the trained neural network while maintaining competitive accuracy and providing useful insight to domain experts in responsible gambling

Repelência de entomopatógenos a Telenomus remus em condições de laboratório.

A utilização de agentes de controle biológico concomitantemente pode provocar interações de diferentes naturezas em ambos. O objetivo deste estudo foi de observar a repelência com e sem chance de escolha entre entomopatógenos e T. remus. Com chance de escolha os tratamentos foram: Baculovirus AEE (Baculovirus anticarsia-VPNAg), Thuricide (Bacillus thuringiensis var. kurstaki), Agree (B. thuringiensis var. aizawai) e Dipel WG (B. thuringiensis var. kurstaki), Boveril EP (Beauveria bassiana), Metarril EP (Metarhizium anisopliae), Trichodermil EP (Trichoderma harzianum), testemunha positiva Lorsban 480BR (clorpirifós) e sem chance de escolha adicionou-se testemunha sem tratamento (negativa). No estudo com chance, em gaiolas, foram oferecidas a T. remus cartelas com ovos de Spodoptera frugiperda, uma tratada e outra não tratada, no primeiro e segundo dia após a emergência dos adultos (DAE). Sem chance, somente cartelas tratadas foram oferecidas em 1 e 2DAE. Avaliou-se: porcentagem de parasitismo (parasitismo) e de parasitóides emergidos (viabilidade). Sem chance de escolha, 1DAE clorpirifós inibiu, com parasitismo de 9,33% e viabilidade de 13,33% e 2DAE clorpirifós 0% e Dipel 13,33% com menor parasitismo. Aos 2DAE maiores parasitismos foram observados para Metarril, 88,76%, Boveril 85,79%, e Trichodermil 86,17% e maiores viabilidades para Baculovirus 98,44%, Dipel 91,34% e Trichodermil 91,29%. Com chance, 1DAE o parasitismo diferiu em: Baculovirus não pulverizado (NP) 71,80% e pulverizado (P) 98,97%, Thuricide NP 90,23% e P 96,47%, Agree NP 93,36% e P 73,18%, Trichodermil NP 85,44% e P 100%, clorpirifós NP 84,22% e P 20,77%. A viabilidade foi: de 96,23% Baculovirus NP e 87,58% P; 97,82% para clorpirifós NP e 3,13% P. Aos 2DAE o parasitismo foi: 50,41% Agree NP e 73,67% P; 91,31% Boveril NP e 98,57%P: 92,26% clorpirifós NP e 0,16% P. Os demais tratamentos e condições não diferiram